In 95% of Cases of Down's Syndrome,there Is One Extra

Multiple Choice

In 95% of cases of Down's syndrome,there is one extra chromosome (number 21) in every cell.This aneuploid condition is most likely the result of

A) failure to suppress DNA replication between meiosis I and meiosis II.
B) failure of the chromosomes to assort independently during meiosis.
C) failure of 1 homologous pair to segregate during meiosis.
D) failure of 2 homologous pairs to segregate during meiosis.
E) failure of the cytoplasm to divide at the end of meiosis II.